The influence of post heat treatments on the evolution of microstructure and mechanical properties of EP741NP nickel alloy produced by laser powder bed fusion

Baskov, F. A.; Sentyurina, Zh. A.; Kaplanskii, Yu. Yu.; Logachev, I. A.; Semerich, A.S.; Левашов, Е. А.

doi:10.1016/j.msea.2021.141340

Cited by 20 publications

(5 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The values of the strength and plastic properties determined at ambient temperature are lower than those reported in the literature [14,15] for the EP741NP alloy of the 1995 generation while meeting the requirements for the EP741NP alloy of the 1981 generation.…”

Section: Discussioncontrasting

confidence: 63%

See 1 more Smart Citation

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Jóźwiak,

Kozakiewicz,

Kachel

et al. 2023

Materials

View full text Add to dashboard Cite

This paper presents an analysis of the causes of damage and fragmentation to the high-pressure turbine (HTP) disc of the RD-33 engine mounted in the MIG-29 aircraft. The authors have carried out an analysis of the changes to the structure of the disc material, both in the areas containing cracks and in the undamaged areas. The impact of structural changes on the alterations in the analysed strength properties along the disc radius was assessed. Material tests were correlated with the analysis of the recorded engine parameters, indicating potential causes of the HPT disc fragmentation.

show abstract

Section: Discussioncontrasting

confidence: 63%

“…Chemical composition of the EP741NP alloy (Sentyurina et Figure 12. Two-phase γ + γ' structure of the tested alloy with carbide precipitations within grain boundaries, with an analysis of the chemical composition and literature data [13,14] regarding the composition of the EP741NP alloy.…”

Section: Elementmentioning

confidence: 99%

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Jóźwiak,

Kozakiewicz,

Kachel

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…Поскольку при СЛС происходит неполное сплавление частиц, то характерными его последствиями являются структурные дефекты, остаточная пористость, микротрещины, приводящие к снижению механических и эксплуатационных свойств изделий. В этой связи крайне важно проводить постобработку СЛС-заготовок с использованием горячего изостатического прессования и последующей термообработки [7][8][9][10][11].…”

Section: Acknowledgmentsunclassified

Structure and mechanical properties of PR-03N18K9M5TYu steel grade fabricated by selective laser melting and post-processing

Kayasova,

Baskov,

Lobova

et al. 2024

Izv.VUZ. Tsvet. Met.

View full text Add to dashboard Cite

We fabricate samples of PR-03N18K9M5TYu steel (equivalent to ChS4) using selective laser melting (SLM) in a nitrogen atmosphere. Our research focused on the influence of hot isostatic pressing (HIP) combined with heat treatment (HT), specifically hardening and aging, on the steel's structure and its physical and mechanical properties (σucs, σys, δ, ψ). Through tensile testing, we evaluated the impact of post-processing treatments (HIP followed by HT) on the material's strength. We also assessed how different post-processing protocols affected residual porosity. Our findings indicate that samples exhibiting the highest strength and plastic properties correspond to those with the least structural defects and minimal residual porosity. In-depth microstructural analysis revealed that the optimal structure–a fine-grained, homogeneous configuration–is achieved via the combined application of SLM, HIP, and subsequent HT. The improvement in mechanical properties can be primarily attributed to the dispersed hardening effect, which is a consequence of the precipitation of the superfluous Ni3Ti phase. Fractographic examination revealed that the post-processing leads to a ductile and dimple fracture, occurring through mechanisms of shearing and detachment, giving rise to mixed-type fractures. The samples that displayed superior mechanical properties were characterized by a homogenous ductile intergranular fracture surface with clear evidence of plastic deformation. We measured the hardness (Н), modulus of elasticity (Е), and elastic recovery via indentation methods. The post-processing treatments notably enhanced material hardness and elastic modulus, with an increase from H = 4.6 GPa and E = 194 GPa in the sample post-HIP to H = 8.5 GPa and E = 256 GPa following HIP coupled with hardening and aging.

show abstract

“…However, the main disadvantage of the hot isostatic pressing process is the cost of the tooling. This makes them only applicable to special applications like aerospace [39]. Secondly, heat treatment at a higher temperature for an extended period can modify the microstructure of an AM material.…”

Section: Recrystallization Via Post-heat Treatment and Its Effect On ...mentioning

confidence: 99%

Creep anisotropy reduction and improvement via post-heat treatment in yttrium-added Hastelloy-X fabricated by laser powder bed fusion

Banoth

Palleda

Saito

et al. 2023

Int J Adv Manuf Technol

View full text Add to dashboard Cite

The development of laser powder bed fusion (LPBF) has made it possible to produce complex threedimensional components for high-temperature applications. The LPBF process needs to be re ned to address several key factors, such as high-temperature elongation, microstructure heterogeneity, and mechanical anisotropy. Hastelloy-X Ni-based superalloy was used to illustrate these issues in this study. First, yttrium (Y) was added to Hastelloy-X alloy to prevent grain boundary embrittlement. The second step involves post-heat treatment at a higher temperature to eliminate the microstructural heterogeneity and creeps anisotropy. We used Hastelloy-X (HX) as reference material, along with 0.046 wt.% Y (HX-y). The aging was done at 850°C for 2 h (DA) for carbides and solution heat-treatment at 1240°C for 8 h upon aging at 850°C for 2 h (HTA) to eliminate microstructural heterogeneity. The creep properties were studied at 900°C/ 80 MPa. The HX-y specimen was strengthened by solid solution and Y-rich oxides and stabilizing oxygen-based contamination at the grain boundary. The DA and HTA HX-y specimens had better creep properties than HX specimens. The HXy specimen showed superior creep properties to the HX specimen due to the presence of carbides M 6 C and Cr 23 C 6 inside grains and at grain boundaries. However, carbides remained stable even at high temperatures within grains and at grain boundaries. Nevertheless, the HTA HX-y specimen exhibited superior isotropic creep properties. As a result of grain boundary pinning, serrated grain boundaries prevented grain boundary sliding. In contrast, HX specimens exhibited poor creep properties.

show abstract

The influence of post heat treatments on the evolution of microstructure and mechanical properties of EP741NP nickel alloy produced by laser powder bed fusion

Cited by 20 publications

References 52 publications

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Structure and mechanical properties of PR-03N18K9M5TYu steel grade fabricated by selective laser melting and post-processing

Creep anisotropy reduction and improvement via post-heat treatment in yttrium-added Hastelloy-X fabricated by laser powder bed fusion

Contact Info

Product

Resources

About